JPS6276974A - Video camera with light - Google Patents
Video camera with lightInfo
- Publication number
- JPS6276974A JPS6276974A JP60216753A JP21675385A JPS6276974A JP S6276974 A JPS6276974 A JP S6276974A JP 60216753 A JP60216753 A JP 60216753A JP 21675385 A JP21675385 A JP 21675385A JP S6276974 A JPS6276974 A JP S6276974A
- Authority
- JP
- Japan
- Prior art keywords
- light
- angle
- lens
- video camera
- optical axis
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、照明灯(ライト)をもつビデオカメラ(ビデ
オカメラをV T Rに一体に組込んだムービーを含む
。)に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a video camera (including a movie camera in which a video camera is integrated into a VTR) having an illumination light.
従来のビデオカメラ用ライトは、ビデオカメラやムービ
ーと別体であり、少なくとも8ボルト50ワット位のも
のが必要で、かなりの電力をt1費した。したがって、
電源としては、電灯線か又はバッテリーを多数並べたも
のを使用した。第8図は把持型ムービーの従来例を示す
外観図で、(1)はムービーを全体として示し、Lはレ
ンズ、(2)はファインダー、(3)はアイカップ、(
4)はバンドを示す。Conventional video camera lights are separate from the video camera and movie camera, require at least 8 volts and 50 watts, and consume a considerable amount of electricity. therefore,
As a power source, a light line or a battery array was used. FIG. 8 is an external view showing a conventional example of a grip-type movie. (1) shows the movie as a whole, L is a lens, (2) is a viewfinder, (3) is an eyecup, (
4) indicates a band.
ところで、ビデオカメラでは、低照度(10ルツクス以
下)において再生画像に色が着かなかったり、ざらざら
した感じの画になったりするので、低照度になると低照
度注放(LLA −Low LightAttentl
on )ランプがファインダー内に点灯し蕩影者に18
:意を与えるよ5になっている。LLAラングが点灯し
たとき、層内ならば照り]を増やせばよいのであるが、
層外だと通常照明装置がな(そのままJ+i−影を伏げ
ることが多いので、きれいな画1家を撮影することは遠
しかった。By the way, with a video camera, in low illuminance (10 lux or less) the reproduced image may not have color or look grainy, so when the illumination is low, the low light attention (LLA-Low Light Attentl) is used.
on) The lamp lights up in the viewfinder and the shadow is 18
: It's 5 to give you an idea. When the LLA rung lights up, if it is within the layer, it is enough to increase the light.
Outside the layer, there is usually no lighting equipment (J+i- shadows are often left as is, so it was difficult to take beautiful pictures of the house).
〔発明が解決しようとする問題点」
そこで、省電力化及び低照度対策として乾電池式(又は
小型バッテリ一式)のライトをビデオカメラに取付ける
ことが考えられるが、6ボルト5ワット位が精一杯で明
るさはずっと暗いものになるので、照射効率を上げなけ
れば実用にならない。[Problem to be solved by the invention] Therefore, as a power saving and low-light countermeasure, it is possible to attach a battery-powered light (or a set of small batteries) to the video camera, but the maximum power is around 6 volts and 5 watts. Since the brightness will be much lower, it will not be practical unless the irradiation efficiency is improved.
本発明は、このような消費′電力が小さく光量の少ない
ライトをビデオカメラに取付けるに当たり、その少ない
光量を最大限に活用しライトの照射効率を上げようとす
るものである。The present invention aims to improve the irradiation efficiency of the light by making the most of the small amount of light when such a light with low power consumption and low amount of light is attached to a video camera.
〔問題点を解決するための手段」
従来の把持型ムービーは固定焦点式で一角(撮影可能範
囲角)が変わらない点に7#目し、ライトの照射角をビ
デオカメラの画角にできる限り合わせるようにした。[Means to solve the problem] Conventional grip-type movies are fixed-focus type, so one angle (captureable range angle) remains the same, and the illumination angle of the light should be as close to the angle of view of the video camera as possible. I tried to match it.
〔作用〕
ライトの照射角とビデオカメラの画角がほぼ一致してお
れば、撮影距離が変わっても無駄な照射や照射範囲の不
足などが避けられるので、照射効率がよくなる。[Operation] If the irradiation angle of the light and the angle of view of the video camera are approximately the same, even if the shooting distance changes, unnecessary irradiation or insufficient irradiation range can be avoided, resulting in improved irradiation efficiency.
第4図は、本発明な把持型ムービーに実施した例を示す
外観図である。同図において(5)は照明装置全体を示
し、(6)は反射板、(7)はランプで(6)と(7)
でライ) (M)を構成する。第5図は、第4図のもの
の要部を示す一部断面図である。同図において、(8)
は乾電池(又は小屋バッチI) −) 、 (9Jは取
付はネジ、aすはネジ(9)のつまみ、aυは保合凸起
を示す。FIG. 4 is an external view showing an example of the grip type movie according to the present invention. In the figure, (5) shows the entire lighting device, (6) shows the reflector, (7) shows the lamp, and (6) and (7)
Construct (M). FIG. 5 is a partial sectional view showing the main part of the device shown in FIG. 4. In the same figure, (8)
(9J is a screw for installation, a is a knob for the screw (9), and aυ is a mating protrusion.
第6図は、照明装置(5)の斜視図である。同図におい
て、SWは照明装fit(57の1源スイツチを示す。FIG. 6 is a perspective view of the lighting device (5). In the figure, SW indicates a one-source switch for lighting equipment (57).
照明装置(5)の取付はネジ(9〕及び保合凸起Ut+
に対応して、ムービー(IJの底面にネジ穴及び凹部が
設けられる。また、レンズLとライトMは、できるだけ
近接して設けられる。なお、本例は照明装置をムービー
に着脱自在としたものであるが、照明装置をムービーと
一体に構成してもよい。To install the lighting device (5), use the screw (9) and the retaining protrusion Ut+
Correspondingly, a screw hole and a recess are provided on the bottom of the movie (IJ).In addition, the lens L and light M are provided as close as possible.In addition, in this example, the illumination device is detachably attached to the movie. However, the lighting device may be integrated with the movie.
第7図は第4図のものの作用を示すω乙四図である。同
図において、2θはレンズLの画角、βはライトMの照
射角を示す。図示のものは、ライ)Mの照射角βがレン
ズLの最至近距離以遠で常に画角すなわち撮影できる範
囲角2θを包含するように構成されている。FIG. 7 is a ω Otsu diagram showing the effect of the one shown in FIG. In the figure, 2θ indicates the angle of view of the lens L, and β indicates the irradiation angle of the light M. The illustrated lens is configured such that the illumination angle β of the lens L always includes the angle of view, that is, the range angle 2θ that allows photographing beyond the closest distance of the lens L.
次に、これを可能とする条件を求めてみる。第2図は、
照射角βを広(して無駄な部分まで照明している状況を
示す説明図である。同図において、Lは撮像レンズ、M
は照明灯(ライト)、Aは撮像レンズLの光軸、0は被
写体、L)U及びDLはレンズLの最外縁を通ってレン
ズLに入り撮像に寄与する光線(レンズ周辺光MA)、
EU及びELはライ)Mの最外縁を通って照射され照明
にを与する光線(ライト周辺光線)を示す。レンズ周辺
光線DUとDLのなす角2θが画角であり、ライト周辺
光&EUとKLのなす角βが照射角である。この図に示
すようにし/ズLによって撮影されない部分まで照明し
ていれは、ライトMの照射効率は恋く大電力を要するこ
ととなり、電池を反相するライトではとても間に合わな
い。第3図は、逆に照射角βを狭くした場合を示す説明
図である。この図のようにライトMの照射角βを狭(す
ると、ライトMの照射効率はよくなるが、レンズLによ
って撮像される範囲の一部分しか照明できず具合が悪い
。Next, let's find the conditions that make this possible. Figure 2 shows
This is an explanatory diagram showing a situation in which the illumination angle β is widened (to illuminate unnecessary areas). In the diagram, L is an imaging lens, and M
is an illumination lamp (light), A is the optical axis of the imaging lens L, 0 is the subject, L) U and DL are light rays that enter the lens L through the outermost edge of the lens L and contribute to imaging (lens peripheral light MA),
EU and EL indicate light rays that are irradiated through the outermost edge of M and provide illumination (light peripheral rays). The angle 2θ between the lens peripheral light rays DU and DL is the angle of view, and the angle β between the light peripheral light &EU and KL is the irradiation angle. As shown in this figure, if the area that is not photographed is illuminated by the light M, the irradiation efficiency of the light M will be reduced, and a large amount of power will be required, and a light that uses batteries in reverse will not be enough. FIG. 3 is an explanatory diagram showing a case where the irradiation angle β is conversely narrowed. If the irradiation angle β of the light M is narrowed as shown in this figure, the irradiation efficiency of the light M improves, but it is inconvenient because only a part of the range imaged by the lens L can be illuminated.
シタがって、レンズLによって撮像できる範囲を充分に
照明し、且つ不必要な範囲を照明しないように、ライ)
Mの位置方向及び照射角βを決めなければならない。(Light) so that the range that can be imaged by lens L is sufficiently illuminated, and unnecessary ranges are not illuminated.
The position direction of M and the irradiation angle β must be determined.
第1図は、このような必要条件を示す説明図である。同
図において、撮像レンズLを単焦点レンズとすると、撮
像できる範囲角(画角)2θは一定である。ライトMの
照射角βは、この画角2θをレンズLの撮像可能な最至
近距H8o以遠で常に包含していなければならない。レ
ンズ中心Pとライト中心Pとが一致すれは、画角2θと
照射角βは同一となるが、これは物理的に不可能であり
、レンズLとライ)Mは成る間隔aだけ離して設置せさ
るをえない。ここに、レンズ中心Pはレンズ元軸A上で
レンズ周辺光aDU、DLが交わる点、ライト中心Pは
ライト元軸B上でライト周辺九線EU、ELが交わる点
である。FIG. 1 is an explanatory diagram showing such necessary conditions. In the figure, if the imaging lens L is a single focus lens, the range angle (angle of view) 2θ that can be imaged is constant. The illumination angle β of the light M must always include this angle of view 2θ beyond the closest distance H8o at which the lens L can pick up an image. If the lens center P and the light center P coincide, the angle of view 2θ and the angle of illumination β will be the same, but this is physically impossible, and the lens L and light beam M are set apart by the distance a. I can't let you down. Here, the lens center P is the point on the lens original axis A where the lens peripheral lights aDU and DL intersect, and the light center P is the point on the light original axis B where the light peripheral nine lines EU and EL intersect.
レンズLとライトMを間隔aだけ離して設置したとき、
不必要な範囲を照明しないための条件は、レンズ光軸A
に対しライト光軸Bをα角だけ傾け、且つ照射角βを小
さくすることである。しかし、レンズLの最至近距離(
レンズLによって撮像できる被写体Oとレンズ中心Pと
の最小限界距離)So以遠でライ)Mの照射角βはレン
ズLの画角2θを包含しなければならないので、ライト
周辺光線の下側の光IWELは、どの撮影距離でもレン
ズ周辺光線の下側の光線DLと交わってはならない。と
いうのは、もし交われば、第3図のように成る距離で照
明されない範囲ができるからである。When lens L and light M are installed with a distance a apart,
The condition for not illuminating unnecessary areas is that the lens optical axis A
In contrast, the light optical axis B is tilted by an α angle and the irradiation angle β is made small. However, the closest distance of lens L (
The minimum distance between the object O that can be imaged by the lens L and the lens center P IWEL must not intersect the lower ray DL of the lens peripheral ray at any shooting distance. This is because if they intersect, there will be an unilluminated area with a distance as shown in Figure 3.
したがって、ライト周辺光線の下側光#ELとレンズ周
辺光線の下側光線DLとは少なくとも平行でなければな
らず、第1図より
θ3〉θ ・・・・・・(1
)少な(とも
o3:θ ・・・・・・(2
)の条件が得られる。ただし、θはレンズ光軸Aとレン
ズ周辺光線DU及びDI、のなす角、すなわち画を通る
光軸(平行光軸)Cとライト周辺光線の下側光線ELの
なす角である。 −
また、第1図から、ライト光軸Bとレンズ光軸A(平行
光軸C)のなす角αは、平行光軸Cとライト周辺光線の
下側光線EUのなす角を02とすると、
θ3+α=θ2−α
・°・ α=(θ2−03)/2
(2)式より
α=(θ2−〇)′/2 ・・・・・・
<3J最至近距離Soの位置におかれた被写体0上のレ
ンズLによって撮像される範囲は2bであり、レンズ周
辺光線の上側光MDUが被写体0と交わる点をQUとす
れば、ライト周辺光線の下側光線EUもまた、被写体0
と少なくとも点QUで交わる必要がある。Therefore, the lower light #EL of the light peripheral ray and the lower ray DL of the lens peripheral ray must be at least parallel, and from FIG.
) small (tomo o3:θ ・・・・・・(2
) conditions are obtained. Here, θ is the angle between the lens optical axis A and the lens peripheral rays DU and DI, that is, the angle between the optical axis (parallel optical axis) C passing through the image and the lower ray EL of the light peripheral ray. - Also, from FIG. 1, the angle α between the light optical axis B and the lens optical axis A (parallel optical axis C) is 02, when the angle between the parallel optical axis C and the lower ray EU of the light peripheral ray is 02. θ3+α=θ2−α ・°・ α=(θ2−03)/2 From equation (2), α=(θ2−〇)′/2 ・・・・・・
<3J The range imaged by the lens L on the subject 0 placed at the position of the closest distance So is 2b, and if the point where the upper light MDU of the lens peripheral ray intersects with the subject 0 is QU, then the light peripheral ray The lower ray EU of is also the object 0
must intersect at least at point QU.
なお、レンズ周辺光線の下側光線DL、が被写体Oと交
わる点は、QLで示す。よって、第1図から、b/5O
=−〇 ・・−・・(4)(b+a
)/So =’≧11 θ2
・・・・・・(5)(4)式より
b=Sota00 ・・・・
・・(6)ただし、bは被写体00面上におけるレンズ
光軸AとQu又はQLとの距離である。Note that the point where the lower ray DL of the peripheral rays of the lens intersects with the object O is indicated by QL. Therefore, from Figure 1, b/5O
=-〇 ・・・・(4)(b+a
)/So ='≧11 θ2
・・・・・・(5) From equation (4), b=Sota00 ・・・・
(6) However, b is the distance between the lens optical axis A and Qu or QL on the object 00 plane.
(6)式を(5)式に代入すると、 −02=(Sota+10十a)/S。Substituting equation (6) into equation (5), we get -02=(Sota+100a)/S.
−13、
・°・ θ2 = tan (6+tan t)
) −p−(7jしたがって、レンズ光軸Aとラ
イト元軸Bのなす角αは、(3)と(7)式より求まる
。-13, ・°・ θ2 = tan (6+tan t)
) -p-(7j Therefore, the angle α between the lens optical axis A and the light source axis B can be found from equations (3) and (7).
一方、照射角βは、
β=03+02
であるから、(1)及゛び(2)式よりβ ≧ θ十0
2
・・・・・・(δ)が得られ、(8)
式が撮像される範囲を常に照明するための条件となる。On the other hand, the illumination angle β is β=03+02, so from equations (1) and (2), β ≧ θ10
2
......(δ) is obtained, (8)
This is the condition for always illuminating the imaged range.
ただし、照射角βが大き過ぎると照明効率が悪化するの
で、その上限を抑える必要がある。実験結果から、
β≦3θ2 °°″−(91と
すべきことが分かった。したがって、ライトの照射角β
の条件として(8)と(9)式からθ+02≦β≦30
2 ・・・・・・Uりが求まる。However, if the illumination angle β is too large, the illumination efficiency will deteriorate, so it is necessary to suppress its upper limit. From the experimental results, it was found that β≦3θ2 °°″−(91). Therefore, the illumination angle of the light β
As a condition, from equations (8) and (9), θ+02≦β≦30
2 ・・・・・・Uri is found.
Ni−Cd’@池を使用し、上述したα及びβの条件を
満足するようにライトをムービーに装着して実験したと
ころ、連続して60分程度の撮影が充分可能であった。When an experiment was carried out using a Ni-Cd'@ pond and attaching a light to a movie so as to satisfy the above-mentioned conditions of α and β, continuous shooting for about 60 minutes was sufficiently possible.
以上説明したとおり、本発明によれは、照射効率がよい
ため低消費電力で光菫の少ない電池式照明灯をビデオカ
メラに使用することができる。また、照明装置全体かビ
デオカメラに一体に取付けられているので、操作性がよ
く取扱いが便利である。更に、照明装置に適当な電源ス
ィッチを設けLLAランプ点灯時にスイッチを入れるよ
うにすれは、再生画像の劣化を防ぐことができる。As described above, according to the present invention, a battery-powered illumination lamp with low power consumption and less violet can be used in a video camera because of its high irradiation efficiency. Furthermore, since the entire lighting device is integrally attached to the video camera, it is easy to operate and handle. Furthermore, if a suitable power switch is provided in the lighting device and the switch is turned on when the LLA lamp is turned on, deterioration of the reproduced image can be prevented.
第11は本発明に必要な条件を示す説明図、第2及び第
3図はそれぞれ照射角βが広すぎる場合と狭すぎる場合
の例を示す説明図、第4図は本発明の夾施例を示す外貌
図、第5図は第1図のものの要部を示す一部断面図、第
6図はムービーに取付ける照明装置を示す斜視図、第7
図は第1図のものの作用を示す説明図、第8図は把持型
ムービーの従来例を示す外観図である。
(1)・・−・・ムービー(ビデオカメラ)、M(6,
7)・・・・・・照明灯(ライト)、(8)・・・・・
・を池、L・・−・・撮像レンズ、2θ・・・・・・画
角、A・・・・・・撮像レンズ元軸、B・・・・・・照
明灯の元軸。11 is an explanatory diagram showing the conditions necessary for the present invention, 2nd and 3rd are explanatory diagrams showing examples when the irradiation angle β is too wide and too narrow, respectively, and 4th is an example of the present invention. Fig. 5 is a partial sectional view showing the main parts of Fig. 1, Fig. 6 is a perspective view showing the lighting device attached to the movie, Fig. 7 is a perspective view showing the lighting device attached to the movie.
The figure is an explanatory diagram showing the operation of the one shown in FIG. 1, and FIG. 8 is an external view showing a conventional example of a grip type movie. (1)...Movie (video camera), M(6,
7)・・・Illuminating light (light), (8)・・・・・・
・Ike, L...Imaging lens, 2θ...Angle of view, A...Imaging lens original axis, B...Illumination lamp original axis.
Claims (1)
をa、最至近距離をS_0とするとき、照明灯の光軸が
上記レンズ光軸となす角αを α=(θ_2−θ)/2 ただし、θ_2=tan^−^1(a/S_0+tan
θ)を満足するように設定し、且つ照明灯の照射角βを θ+θ_2≦β≦3θ_2 を満足するように設定したことを特徴とする照明灯付き
ビデオカメラ。[Claims] A battery-powered illumination lamp is provided close to an imaging lens, 1/2 of the angle of view of the lens is θ, the distance between the lens and the illumination lamp is a, and the closest distance is S_0. When the angle α between the optical axis of the illumination lamp and the optical axis of the lens is α=(θ_2-θ)/2, where θ_2=tan^-^1(a/S_0+tan
A video camera with an illumination lamp, characterized in that the irradiation angle β of the illumination lamp is set to satisfy the following: θ+θ_2≦β≦3θ_2.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP60216753A JPH0740724B2 (en) | 1985-09-30 | 1985-09-30 | Video camera with lighting |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP60216753A JPH0740724B2 (en) | 1985-09-30 | 1985-09-30 | Video camera with lighting |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS6276974A true JPS6276974A (en) | 1987-04-09 |
JPH0740724B2 JPH0740724B2 (en) | 1995-05-01 |
Family
ID=16693381
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP60216753A Expired - Fee Related JPH0740724B2 (en) | 1985-09-30 | 1985-09-30 | Video camera with lighting |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0740724B2 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7668448B2 (en) | 2005-08-29 | 2010-02-23 | Sony Corporation | Flash apparatus and imaging apparatus |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS52135824U (en) * | 1976-04-10 | 1977-10-15 |
-
1985
- 1985-09-30 JP JP60216753A patent/JPH0740724B2/en not_active Expired - Fee Related
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS52135824U (en) * | 1976-04-10 | 1977-10-15 |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7668448B2 (en) | 2005-08-29 | 2010-02-23 | Sony Corporation | Flash apparatus and imaging apparatus |
Also Published As
Publication number | Publication date |
---|---|
JPH0740724B2 (en) | 1995-05-01 |
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